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Three-magnon splitting and confluence processes for spin-wave excitations in yttrium iron garnet films: Wave vector selective Brillouin light scattering measurements and analysis

César L. Ordóñez-Romero, Boris A. Kalinikos, Pavol Krivosik, Wei Tong, Pavel Kabos, and Carl E. Patton
Phys. Rev. B 79, 144428 – Published 27 April 2009

Abstract

Brillouin light scattering (BLS) has been used to observe and confirm the existence of nonlinear three magnon splitting and confluence processes for propagating spin waves in the magnetostatic backward volume wave configuration. Wave vector and frequency selective BLS techniques were also used to provide a quantitative map of the wave vector make-up for the parametrically excited half-frequency dipole-exchange spin wave (DESW) split magnons and the confluence magnons that result from the recombination of these DESW modes. The experimental wave vector maps for the product splitting and confluence magnons matched nicely with those expected from spin-wave theory. The data were obtained with (1) a strip line excitation/detection transducer structure, (2) forward-scattering BLS optics, (3) a fixed magnetic field of 352 Oe applied along the propagation direction, (4) pumping frequencies from 2.5 down to 2.1 GHz, (5) and cw input powers from 200μW to 6 mW. The wave vector selective measurements utilized variable diameter circular diaphragms, rotatable slit apertures, and circular light blocks to access spin waves with wave numbers from about 100 to 3.6×104rad/cm and the full 360° range of propagation angles.

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  • Received 5 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.144428

©2009 American Physical Society

Authors & Affiliations

César L. Ordóñez-Romero1,2, Boris A. Kalinikos1,3, Pavol Krivosik1,4, Wei Tong1, Pavel Kabos5, and Carl E. Patton1

  • 1Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
  • 2Universidad Nacional Autónoma de México, Ciudad Universitaria, México D.F., Mexico
  • 3St. Petersburg Electrotechnical University, 197376 St. Petersburg, Russia
  • 4Slovak University of Technology, 81219 Bratislava, Slovak Republic
  • 5National Institute of Standards and Technology, Boulder, Colorado 80305, USA

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Issue

Vol. 79, Iss. 14 — 1 April 2009

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